0,2
a(n) = n*( n*(2n+1)+1 + n*(2n+1)+2 + ... + n*(2n+1)+2n )
a(n) = n*A000290(n); n*a(n) = A014105(n)^2
a(3) = 147 since 147 = 3*7^2
Sequence in context: A088064 A080812 A116169 * A006974 A171480 A007681
Adjacent sequences: A084364 A084365 A084366 * A084368 A084369 A084370
easy,nonn
Charlie Marion (charliem(AT)bestweb.net), Jun 22 2003